The boat capsized after setting off for Europe from neighboring Libya. Four survivors have been rescued, who told Tunisian coast guards the ship was carrying around 86 people.

The coast of western Libya is one of the main departure points for African migrants hoping to reach Europe.

The International Organisation for Migration’s, IOM, Missing Migrants Project estimates 682 migrants have died in the Mediterranean so far in 2019.

Thousands of migrants have died in each of the past several years making the journey, although the numbers this year have so far been lower due in part to European-backed efforts to halt people smuggling from Libya.